Steam-generator and furnace therefor.



No. 668,463. Patented Feb. I9. I901. R. SCOTT.

STEAM GENERATOR AND FURNACE THEREFOR. (Application filed Feb. 19, 1900.(No Model.)

2 Sheets-Sheet I.

No. 668,463. 7 Patented Feb. l9, I9OI. R. SCOTT. STEAM GENERATOR ANDFURNACE THEREFOR.

[Application filed Fab. 19 1900.) (No Model.) 2 Sheets-Sheet 2.

UNTTFD STATES PATENT @rrrcn.

ROBERT SCOTT, OF LONDON, ENGLAND.

STEAlVi GENERATOR AND FURNACE THEREFOR.

SPECIFICATION forming part of Letters Patent N 0. 668,463, datedFebruary 19, 1901.

Application filed February 19, 1900. $eria1N0. 5,802. (No model.)

T at], whom, zit may concern:

Be it known that 1, ROBERT Soon, a subject of Her Majesty the Queen ofGreat Britain, residing at London, in the county of Middle sex, England,have invented certain new and useful Improvements in and Connected withSteam-Generators and Furnaces Therefor, of which the following is aspecification.

My invention relates to that class of steamgenerators wherein the fuelis placed upon a plate (instead of, as is usual, upon fire-bars) andcombustion supported by the introduction of a forced draft throughsuitably formed and placed twyers.

My principal object is to provide an arrangement for the above purposeand whereby the economies and improvements hereinafter indicated areeffected. In particular 1 provide an arrangement that is capable ofbeing inserted within and as easily removed from the furnace of awater-tube boiler, a refusedestructor furnace, or the fine of a Cornish,Lancashire, Scottish, marine, or other similar boiler in lieu or afterthe removal of the usual fire bars or grate;

By my invention 1 am enabled to use cheaper classes of fuel (forexample, small coal or coal-dust) in the furnaces and to render thecombustion much more complete, and the arrangementis such that the fuelis consumed in intimate contact with the water to be heated. V

The characteristic features of my invention are that the fuel is placedupon a watercontaining supporting plate through which extend twyers withclosed tops and lateral or deflected discharge-orifices that form theonly communication between the combustionchamber and a chamber beneaththe watercontaining fuel-supporting plate into which air is forced underpressure. The particular construction of twyers avoids the possibilityof their becoming clogged or of the small particles of fuel fallingthrough them into the air-chamber beneath, and at the same time the airissuing from them is directed laterally supporting plate.

ter and the series of twyers which pass Vertically up through thefuel-supporting plate and are closed at the top, but have lateral ordeflected dischargeorifices through which air is fed to the fuel. Thesetwye s may be made of separate pieces of metal removably secured to thefuel-supporting plate, and the chamber passage or passages in the platemay be connected with the feed-water system or direct with the boiler.The said twyers may also serve to brace the upper and lower parts of thefuel-supporting plate together, and they are fed with air under pressurefrom the comnon chamber b low the fuel-supporting plate.

In the accompanying drawings,which illustrate my invention, Figure 1 isa front elevation, partly in section; and Fig. 2 is a sectionalelevation taken on the line A B, Fig. 1, of a marine boiler with myinvention applied thereto. Fig. 3 is a plan of the fuel- Fig. at is adetail, hereinafter referred to, drawn to an enlarged scale; and Fig. 5is a transverse section throughthe fuel-supporting plate, illustratingamodified mode of construction thereof.

Referringfirst particularly to Figs. 1, 2, and 3, a is the air-chamber,and b is the Waterchamber. The walls of the air-chamber a consist of thelower plate of the water-chamber b and a shell 0. Through thewater-chamber 12 pass the twyers d, preferably in the form shown in Fig.4. These twyers d are closed at their tops and are provided withlaterally-directed nozzles 6 immediately beneath, by means of whichcommunication is established with the air-chamber a through theWater-chamber b. If the twyers are screwthreaded, as shown at fand g inFig. 4, and are screwed into the walls of the Water-chamber 12 up totheir shoulders h and then secured in position by nuts t', the saidtwyers will form a series of stays, thereby materially adding to thestrength of the Water-chamber. The twyers are each preferably providedwith two diametrically opposite nozzles or discharge- 7 orifices, andthe said twyers are preferably arranged in lines and alternate inposition, as shown in Fig. 3. Their number is regulated Thefuel-supporting plate,with its adjuncts,

. are the side plates.

be held therein by any suitable means, such as attachment to thefurnace-front j.

The furnace-front is provided with a gratedoor 19 of ordinary orconvenient construction, but is otherwise closed except for the pipe g,by which forced draft derived from a fan or equivalent means (not shownin the drawings) gains admission to the chamber a.

The fuel is fed onto the upper surface of the supporting-plate, wherecombustion is supported by the forced draft issuing through the twyersd. The water in the water-chamber 19 being in close proximity with theburning fuel is intensely heated. If such waterchamber is intended toform part of the feedwater system, the water will enter by the pipe 1and beled therefrom to the hot-well by the pipe 3, or it might be feddirect into the boiler by means of an injector, donkey-pump, or othersuitable means. Alternatively, if the said water-chamber is to form partof the boiler system, thereby increasing its heatingsurface andproducing a rapid circulation, there are provided pipe connections tu(shown in broken lines in Fig. 2) between the waterchamber and theboiler proper.

Fig. 5 illustrates a simple and practical mode of constructing thewater-chamber in such a way that the bottom plate can be removed withoutdisturbing the twyers and ready access gained to the interior of thechamber for cleaning or other purposes. 8 is the top plate, 9 the bottomplate, and 10 10 The top plate 8 is secured by rivets 11 or otherwise tothe side plates 10, and the bottom plate is secured by bolts 12 orotherwise. The twyers cl arc first screwed into the top plate 8. A nutl3 may next be added. Then a nut or collar 14 is passed up the screwedstems of the twyers to the point shown in the drawings. The bottom plate9 is fastened to the side plates 10, and finally the nuts 15 are placedin position. It will be obvious that by simply removing the nuts 15 andthe bolts 12 the bottom plate can be removed for the purpose of cleaningthe chamber bor otherwise.

It will be apparent that material advantain water, because in that caseoverheating and rapid destruction of the plate occurs, clinker rapidlyforms and adheres thereto, and the fuel during consumption on thefuelplate is not in intimate contact with the water to be heated.

In my invention the life of the fuel-supporting plate is prolonged byreason of the water circulation. The water is rapidly heated owing tothe close proximity of the burning fuel. Small and cheap fuel can beemployed and the same cannot percolate into the air-chamber beneath,because of the imperforate character of the plate and the closed tops ofthe twyers, while the air reaching the combustion-chamber beingdeflected laterally is compelled to percolate the fuel and to aidcomplete combustion.

I claim as my invention- The combination in a steam-generator of acombustion-chamber, a chamber into which air is forced, afuel-supporting plate interposed between the combustion-chamber and theair-cham ber and consisting of two horizontal parts arranged a suitabledistance apart to provide a water-chamber between them, twyers securedto said upper and lower parts of the fuel-supporting plate and servingto brace them, said twyers being closed at the top but having openingsin their sides above the fuel-supporting plate, and opening also intothe air-chamber below the fuel-support ing plate.

In testimony whereof I have hereunto subscribed my name.

ROBERT SCOTT.

Witnesses:

A. F. SPOONER, J. S.- WITHERS.

